Preparation of polyphenols by oxidation of hydroxybenzaldehydes
US4435601A · kind A · utility
42Cited by
5References
36Claims
0Family size
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Key dates
| Filing date | Jul 7, 1981 |
| Grant date | Mar 6, 1984 |
| Priority date | — |
| Expiry date | Jul 7, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C41/30
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Optionally aldehyde substituted polyphenols are prepared by oxidizing, with hydrogen peroxide, a hydroxybenzaldehyde bearing at least one aldehyde substituent ortho- and/or para- to the nuclear hydroxyl group, in an aqueous reaction medium and in the presence of an alkali or alkaline earth metal base, the process being characterized in that the pH of the reaction medium is continuously maintained at a value no greater than 7 throughout the course of the oxidation reaction. The subject process is well suited for the preparation of, e.g., hydroxy-p-vanillin from guaiacol, and the novel compound 2,4,6-triformylphenol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.